Chapter 7, Problem 7.16E

Many police departments use breath tests to check for drunk drivers. What would be the approximate partial pressure of ethanol in expired breath if the blood alcohol content is approximately $0.0\text{6 mole \%}$ (that is, $x_{\text{ethanol}}=0.0006$)? The equilibrium vapor pressure of ${\text{C}}_{\text{2}}{\text{H}}_{\text{5}}\text{OH}$ at $3{\text{7 }}^{\text{ο}}\text{C}$ is $115.\text{5 torr}$. Use your answer to comment on the necessary sensitivity of the test.